all of the OEM 1962 to 1974 RB, 413, 426 and 440 automatic crankshafts I've dealt with are not machine the correct depth or the correct I.D. for the stock length input shafts for the OEM NP 833 trans.n the automatic cranks with the NAPA pilot bushings
I'd have to disagree with the "all" in that statement. The majority of forged automatic cranks were pilot drilled 13/16" which is sufficient to clear the 3/4" pilot on the 833 and are plenty deep (usually over 1 1/2") but only standard shift cranks were reamed to the final size of 15/16" to accept the bushing.
